import 'lib/Wallet.dart';

main(){

  // 1.创建钱包对象
  Wallet wallet = Wallet();
  // 2.存钱
  wallet.saveMoney(100);
  wallet.printBalance(); 
  // 3.取钱
  wallet.withdrawMoney(20);
  // 4.打印余额
  wallet.printBalance();  
}